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The definitive source for rare cactus collectors
Encyclopedic care guides, species profiles, and a rarity index built by a curator — alongside ethically-sourced specimens sold exactly as photographed.
11
Genera covered
300+
Species profiled
4
Rarity tiers
Genus key
Ariocarpus
Lophophora
Copiapoa
Mammillaria
Astrophytum
Echinopsis
Turbinicarpus
Aztekium
Ferocactus
Gymnocalycium
Pseudolithos
The encyclopedia
Browse by genus
In-depth profiles, care guides, and rarity rankings for every genus we cover.
Ariocarpus
Living rocks
Slow-growing, flat-bodied masterpieces of the Chihuahuan Desert. Among the most sought-after collector cacti in existence.
Lophophora
A button-like cactus
The best-known species, Lophophora williamsii, grows in the Chihuahuan Desert along the Texas–Mexico border, tucked into desert scrub on limestone hillsides.
Copiapoa
Atacama giants
Native to the driest non-polar desert on Earth. Slow, architectural, and increasingly rare due to habitat destruction.
Mammillaria
Pincushion cacti
The largest cactus genus — but select rare species remain almost unknown in cultivation. A genus with surprising depth.
Astrophytum
Star cacti
Geometric perfection. Rare cultivars and Japanese hybrids command serious collector prices. Deeply satisfying to grow.
Echinopsis
Trichocereus, San Pedro
Spectacular nocturnal blooms and rare forms including cristate and monstrose mutations. Serious collector depth.
Turbinicarpus
Turbo cacti
Tiny, threatened, and extraordinarily beautiful. Many species are critically endangered in their native San Luis Potosi.
Aztekium
Stone flowers
Only three species exist. Grows on near-vertical gypsum cliffs. The rarest cultivated cactus genus in the world.
Ferocactus
Barrel cacti
Bold, architectural barrels with spectacular spine forms. Certain species offer genuine collector appeal and striking presence.
Gymnocalycium
Chin cacti
South American gems with subtle beauty. Rare forms include stunning variegates and colour mutations prized by collectors.
Pseudolithos
False stone
Known for their unusual stone-like or pebble appearance. These plants originate from the arid regions of East Africa and the Arabian Peninsula and require special care for successful growth and flowering.
The rarity index
A curator-ranked guide to the world’s rarest cultivated cacti
Not all rare cacti are equally rare. Our index ranks specimens by wild population, cultivation difficulty, and trade availability.
Explore the index →S
Critically rare — almost never available
Aztekium ritteri, Turbinicarpus alonsoi
7 species
A
Very rare — specialist trade only
Ariocarpus agavoides, Copiapoa cinerea
18 species
B
Rare — occasional availability
Ariocarpus fissuratus, Mammillaria luethyi
31 species
C
Uncommon — findable with patience
Astrophytum asterias, Ferocactus glaucescens
50+ species
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